New gay marriage laws in Maine, Maryland and Washington could generate more than $166 million in wedding spending in the next three years.

The Williams Institute at the UCLA School of Law estimates that nearly 18,000 same-sex couples in the three states will exchange vows in the first three years after the new laws are in effect.

Wedding-related spending for in-state couples is expected be about $16 million in Maine, $63 million in Maryland and $89 million in Washington. The estimates do not include out-of-state same-sex couples that travel to those states to marry.